Hoisting mechanism.



' rotation.

7 vattion'ofthe clntinjand sploclfrets. Fi?. `5 'is hoistingehmns ond beatings of iiotatien Wheel andicll ,UNITED STAfijieS "i'AfiENT einen.

*EDWIN lrlARltlllClTtlN. SQ'N l. H. lLADELPHl A AND @mouw PENNSYLVANM.

INUORPORATEIL' Hoasme MEGHMMSM.

9:35) UWE@ Be it known thztt l., ltommr la, 5Com', u. sitlzen of the 4United States, 'residing et Philadelphie, in lllloeountv of Pllmlel'aho mld' State of lezmsylvanin, -lmxe imented oeltailx Improvements in oistiu'g .ltleel'nub ism, out Wllich the following je e. spetrifiozxtion.

This' invention relates; pm'tioulerly to therefor.

it eempl'lses eelmio-wlxeel with spreek-.ets having ibeamingi-stu'mwe with Straight elements Square with. lre.lvlemeeto the plane olf' lotfttion and zt allein llmvijng; end bea-ring'- suifaees with substantially stmigllt elements` coinciding with the elelinents of the spree;- ets o1" square with reference to the plane oi Thesprookets and chain links me thus provided with contacting bomingsur faces at night angles 'te the line of ioree to pl'e'verit'slipping, Wea-1', and distortion mld to provide continuously the smooth oecula-te movement, which is a. desideretum not commonly maintained in apparatus of this description. They links engaged. by the spioekets are drop -iorgect with substantmlly rectangular outerlines and Curved in:l temstl bearings for the;coneet,lng-linl s, by whiel'l theldesired accuracy, strength, and durability moy be obtained.

Speocatiou of Letters Patent.-

, to col In the accompanying drawings', Figure l is :t Sec-tional View taken parallel tothe plone ain embodying my' inventiol'l. Fig. Zie-"af sectional View tekenen the line 2 f3 of Fig. i, the link; in. the plane of intersect-tion being shown lie full. Fig. is y:Ldeveloperl perp'heml View' el the Wheel .and ehem Fig. i 1s it'rdet*el0pefl=.ele-

a. plm; View ofthe improved link employed in the chain. Fig. 6 is n. sectional View taken on'tl11eline-6 of Fig. 5, 'Showing the noimol section of the link; and Fig. i is o. sectional vieu/ taken on :the line 7 7 of li .5,.showing 'the reinforced limit-,section which 'results 'ljom the bearings en'lployed and provides the strength desired.,

As shown in the dmwigs, the chain oompl'ises theflinlis A and B.

The likgafA 11u-ve thes'tmight oute' sides a Slight com.er-curi'es c, termin g zlfppeximfttoly large sprockets, and, olwites the ten Patented. Dec. 25, l.'

:l reetsm 0, :mrl the `straight inner Sides d,v jluefl b3.' me eux-ved imm-ings e, producing a [o1-1u having; the section 7 taken through a. emmer oit the link and. the center of e curved 5 5 Mme; homing, which is am ovali having a,

:minor axis equal to the norma-l Section ofi the link and n, major axis sullieently in excess tlweeol to provide the desired internal. and twine-.l beau-.lugs :mdv prevent :all tendency 6o lapsing or distortion. These links are des A, eti to be {l-ogyfofged and, een there-, foi-e readily oe made accurate ill-form from steel'of the clmraetexxdesirod for strength and' Wem', avoiding the Weaknesses and inaocura.- 65 eies found in the usual. welded links and securing stapel-iol' enduramee and continued ite- Gurney 01"' operation.

The links B, 'which connect the links A, .may have the 'usual straight outer Sides j", 7e gonnewtefiy 'by ourvecl outer ends g, and straight inner sides la, joined by curved imxer (wis or 'bearings i., and they may be formed :11ml Welded 1o. the usuel manner.'

The el1:zin--Wiie1,l has the groove j for gluu- 7 5 ing the links B and. the sprockets Z for engaging-the links A, the l ear1ngsu1faees m of the S ,toelets being substantially at right 2mgles to the lane ol? rotation and to the,A wlleels perplleml llanges n. The bearing- 8 0 surfuees in ol" the Sprockets converge toward the sprocket-Curves, and the distance bet\.voe;f1 alle bearing-surfaces et the ends of the several poe/klets 0 is enouglfgreeter than thev length of the links A so th at in lifting 01 low- 8 5 ering the engaging spxoekets will. pinch end gradually work into und out 0l'- engagement with the allein, 'which renders the notion Snleoth, povides for freely releasing the chain., and prevents climbing.

The. reetengulai d1'op01'ged links for engaging the Sprockets are made shorter theo. the. hand-welded oonneeting-linls to give more toom in the pockets and to prevent climbing that has heretofore resulted when .95' the chain lengthene by stretching o1 Wear.

A forthef reason ,For using the short and long links is fo'umil im the feet that it permits the ol.t comjjmmtively shoi't Jookete,

(llencv to roo collapse 'm the linke engaging the e )rockets md 'provides .greater strength. in tue parts size and form for laceomplishi already indicated.

Having described my invention, I clairni 5 Ach 'by a single curve necting said first yl xo a sprocket-Wheel gages and holds sai Whioh it is desirable t o maintain of constant l ng the action 1 ngular outer plan and an ting in ends eachA outlined l a second Set of links cony inks, in combination' with having a gToove which enl d second links in a vertical l links, said s Flane and sprockets which engage said first nks disposed transversely to the vertical prookets extending substantially at right angles to said plane.

In testimony Whore my hand, this 9th day the presence o Witnesses UTLEY E of I have heieunto set ol November, 1904, 1n

i the subscribing:r witnesses.

EARLEY, CRANE, J1'. 

